Screw-driver attachment.



R. A. ARMSTRONG.

SCREW DRIVER ATTACHMENT.

APPLICATION FILED MAR.14,1912.

Ly. Patented Now/.10,19%

Mm @vf/@Www Mfg jaws 2, as shown, is notched centrally in alinement with the axis of the device to receive the neck of a screw 8, therein, as indicated in Fig. 6.

The operation is as follows: When used driver is inserted in screw setting, the screw into place and firmly gripped therein by means of the chuck 6, which is closed thereon by the rotation of the sleeve 4, on the threaded shank i, acting to force the jaws of the chuck inwardly into binding engagement with the shank of the screw driver. When the 'blade of the screw driver is properly positioned to suitably engage in the slot in the head of the screw, as indicated in Fig. l, the sleeve 3, may be retracted suficiently on the threaded shank l, to permit the jaws to' move outward suiiiciently to permit the insertion of the neck of the screw into place, and when set up with the blade of the screw driver in the slot in the screw head, the screw is irmly held in axial alinement with the tool and driver, and may be very readily driven without necessitating the use of the hand in steadying or holding the screw. The device may be instantly released from the screw by slight retraction of the 'sleeve 3, permitting the jaws to move apart sutiiciently for that purpose, or the sleeve 4, as well as'the sleeve 3, may be slightly released, permitting the screw driver to rotate freely independently of the holder, and thus drive the screw head downwardly until the same is driven home. In driving or retracting the screw, one half of the head of which is broken away, it is obvious that the holder acts to firmly'hold the neck of the screw, while the pressure of the fiat side of the head in the groove against the screw driver will prevent rotation thereof relatively to the screw driver, thus permitting the screw to be either driven or retracted, as preferred, When used as a hand vise, it is obvious that the use thereof is similar to other hand vises, except that owing to the construction described, an exceedingly firm grip may be had upon the object in the holder, thus preventing any tendency to slip. rlhe sleeves may be shaped, formed or milled in any suitable manner to afford a satisfactory grip for the hand to permit the sleeves to be readily actuated in opening or closing the device.

It is to be understood, of course, that details of construction may be varied through a wide range, and, inasmuch as I have aliases that the preferred) shown but one (and I do not purpose hmorm of my invention,

iting the patent to be granted on this appli-l cation, otherwise than necessitated by the prior art.

I claim as my invention:

l. A device of the class described, embracing an externally threaded screw-driver receiving tube, resilient lingers integral therewith at one end, a sleeve freely slidable on said tube and adapted to be forced into engagement with said resilient fingers to cause them to approach each other, an intermediate sleeve threaded on said tube and adapted by its engagement with said resili ent finger sleeve to retain the same in adjusted position against movement away from said resilient fingers, and a sleeve threaded on the other end of said tube and adapted to control means for gripping the screw-driver shank.

2. A device of the class described, embracing an externallv threaded screw-driver receiving tube, resilient lingers integral therewith at one end, a sleeve threaded on the other end of said tube, and tapered jaws movable with said sleeve and disposed within said tube, whereby movement of said sleeve on said tube toward said resilient fingers will force said tapered jaws inwar to grip a screw-driver shank lying therein.

3. A device of the class described, embracing an externally threaded screw-driver receiving tube, resilient fingers integral therewith at one end, a sleeve freely slidable on said tube and adapted to be forced into engagement with said 'resilient fingers to cause them to approach each other, an intermediate sleeve threaded on said tube and adapted by its engagement with said resilient finger sleeve to retain the same in adjusted position against movement away from said resilient lingers, a sleeve threaded on the other end of said tube, and tapered jaws movable with said sleeve and dis osed within said tube, whereby movement o said sleeve on said tube toward said resilient fingers will force said tapered jaws inward to grip a screw-driver shank lying therein.

In testimony whereof I have hereunto subscribed my name in the presence of two subscribing witnesses.

RALPH A. ARMSTRONG.

CHAs. A. DEAN. 

